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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Structure of Amines01:19

Structure of Amines

The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Synthesis of a Water-soluble Metal&#8211;Organic Complex Array
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Long tailed cage amines: Synthesis, metal complexation, and structure.

Birger Dittrich1, Jack M Harrowfield, George A Koutsantonis

  • 1Chemistry, M313, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, 6009, Australia.

Dalton Transactions (Cambridge, England : 2003)
|April 10, 2010
PubMed
Summary

Researchers synthesized novel amphiphiles from sarcophagine-class macrobicyclic hexamines using reductive alkylation. The magnesium(II) pathway offers a convenient route to isolate ligands for creating metalloamphiphiles with various metal ions.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Coordination Chemistry

Background:

  • Macrobicyclic hexamines, specifically the sarcophagine class, are versatile molecular scaffolds.
  • Amphiphiles are molecules with both hydrophilic and hydrophobic properties, crucial for self-assembly and biological interactions.

Purpose of the Study:

  • To develop an efficient method for synthesizing amphiphiles derived from sarcophagine ligands.
  • To explore the formation of metalloamphiphiles using these novel ligands and various metal ions.

Main Methods:

  • Reductive alkylation of amino-functionalized sarcophagines using long-chain aldehydes.
  • Complexation of sarcophagine ligands with copper(II) and magnesium(II) ions.
  • Isolation of free ligands and subsequent complexation with different metal ions.

Main Results:

  • Successful synthesis of amphiphiles derived from sarcophagine ligands.
  • The magnesium(II) complexation pathway proved efficient for ligand isolation.
  • Structural characterization of a protonated free ligand and its metal complexes was achieved.

Conclusions:

  • The developed reductive alkylation strategy provides a facile route to sarcophagine-based amphiphiles.
  • The methodology allows for the preparation of diverse metalloamphiphiles with potential applications in materials science and nanotechnology.